Operating Limits show need for testing speeds and specifies weight at that testing. Question is: Is it a requirement to test the aircraft at maximum gross weight and at the max forward and aft CG limits the kit manufacturer has designed for.
Ed
And it may also be obvious (but I could tell you stories....): Portland cement is much more dense than sand; weight in a smaller package. DO NOT USE PORTLAND CEMENT as your weight. Sand flying around in your cabin is a drag; cement can be deadly!. Yeah, you think that would be obvious but....... Makes me shudder to even think......
There should be a paragraph within your phase II operating limitations that states:
The pilot in command must not perform any maneuvers that have not been flight-tested or operate the aircraft outside the weight, airspeeds, and center of gravity limits tested. (51)
I did test to 110% of Vne.
I believe the Vne test is something that VERY FEW actually perform.
If you do use a granular material - sand, gravel, portland cement, dog food, whatever...Double bag it. You'll greatly reduce the chances of needing to deal with "Cleanup on Aisle 5".
For good reason, I think. It's called "NEVER EXCEED speed".